Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b64935140b70e2…

MALICIOUS

PDF

35.4 KB Created: 2021-05-21 19:16:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c93b180fb9ba554254191303e05953a6 SHA-1: 86ffbea15983d5a035ff72ab6fb676fcd2cab1de SHA-256: f8b64935140b70e222a8d5efa54bf2a83c9353c41c64a37ceefe0961351e7df7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document displays a fake CAPTCHA lure to entice users to click on a malicious URL. The embedded URL and other extracted URLs point to sites that likely host further malicious content or exploits. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/479516143/free-minecraft-skins-pe-game-hack
    • http://www.art-concept.gr/images/www-free-robux-com_GM431946152.pdf
    • http://www.art-concept.gr/images/roblox-free-items-glitch_GM431946152.pdf
    • http://www.art-concept.gr/images/how-to-generate-free-coin-master-spin_GM406889139.pdf
    • http://www.art-concept.gr/images/master-free-spin_GM406889139.pdf
    • http://www.art-concept.gr/images/can-i-hack-coin-master-with-lucky-patcher_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003300.bin
57ce89de628920d64d21b5a60db346dbf41f94022b5473f5f219aa9f81a2681f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3300 24220 bytes
font_01_sfnt_off00006a5e.bin
38d2ac9589c51081060ff5b719ef2985d9213db1bca3ba0b1a36204662c24b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5E 17892 bytes

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